A documentary film that presents the visionary work and ideas of Iannis Xenakis - structured around musical performances, interviews and testimonies from his collaborators. With performances by Sylvio Gualda, Elisabeth Chojnacka, Benny Sluichin, Frances-Marie Uitti, Lori Freedman, Christophe Roy, and Spiros Sakkas. Xenakis speaks and is seen in rare archival footage of performances of Polytope de Mycenae, La Legénde d?eer and the opera Oresteia. It examines his architecture, including the Philips Pavilion at Expo 58, the convent of La Tourette and his own house in Corsica, and investigates the UPIC - Xenakis? pioneering system which allowed music to be composed by drawing on a computer screen - a culmination of his quest to turn forms realised in space into sound.